The Last Word with Lawrence O'Donnell 12/21/17

Oversight Democrat Cummings: GOP trying to discredit Mueller, FBI

Elijah Cummings, ranking member on the House Oversight Committee, says Republicans are trying to smear and delegitimize Robert Mueller's investigation and the FBI. This come as the probe closes in on Donald Trump. Eric Boehlert & Jonathan Capehart join Joy Reid. ... more Duration: {{video.duration.momentjs}}